William e



(No ModeL) W. E. SPARKS. LOOK.

No. 443,264. Patented Dec. 23, 1890,

UNITED STATES PATENT OFFICE.

\VILLIAM E. SPARKS, OF NEIV HAVEN, CONNECTICUT, ASSIGNOR TO SARGENT &COMPANY, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 443,264, dated December23, 1890.

Application filed September 1, 1890.

To all whom it may concern.-

Be it known that I, WILLIAM E. SPARKS, of New Haven, in the county ofNew Haven and State of Connecticut, have invented a new Improvement inLocks; and I do hereby declare the following, when taken in connectionwith accompanying drawings and the letters of reference markedthereon,to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, andrepresent, in-

Figure 1, a view in inside elevation of a latch mechanism provided witha hub or rollback constructed in accordance with my invention. Fig. 2 isa view, partly in plan and partly in transverse section, showing a latchmechanism provided with my improvement, a pin-lock, and a section of adoor, and illustrating how the two mechanisms are connected by acoupling-bar entering the deep slot in the hub or roll-back of the latchmechanism. Fig. 3 is a detached perspective view of the hub orroll-back.

My invention relates to an iinprovementin locks, and more particularlyto the hubs or roll-backs of latch mechanisms designed to be secured toone side of a door and connected by a coupling-bar located in atransverse opening therein, with a pin-lock mechanism ap plied to theopposite side of the door, the object of my invention being to produce asimple, cheap, and strong hub or roll-back adapted, withoutdetrimentally modifying the latch mechanism of which it forms a part, toin itself compensate for the variations produced by variation in thethickness of doors and in the surplus length of the bars, which must belong enough as supplied to the trade to answer for the thickest doorsand yet are not easily shortened for thinner doors by the consumer.

With these ends in view my invention consists in a hub constructed ashereinafter described, and particularly recited in the claim.

A represents the hub, which is of cylindrical shape, provided on oneside with arms A A, projecting in opposite directions and in a plane atright angles to the axis of the hub, substantially as in the usualconstruction. From the arm side of the hub a slot is cut diametricallyinward, openfrom the arm side Serial No. 368,614. (No modeli) and acrossthe hub, so as to make a clear slot across the hub and extending nearlythrough the hub, leaving sufficient material at the opposite end tosupport the two parts or prevent their separation. The hub is cast asusual and the slot is cut with a milling-tool, the length of the slotcorresponding to the thickness of the coupling-barC. The depth of theslot is sufficient to compensate for the varia* tions in the surpluslength of the coupling bar C, produced by variations in the thickness ofthe door D. By forming the slot clear across the hub and between itsarms I am enabled to adapt the hub to compensate for variations in thesurplus length of the coupling-box with the minimum of expense, as theoperation is simply one of free milling. Heretofore hubs have beenconstructed with alongitudinal opening into the end of the hubcorresponding in width and thickness to the width and thickness of theconnectingbar; but in that construction the hub was necessarily made intwo parts and is expensive when compared with the milling operationrequired in this invention. Hubs have also been provided for a similaradjustment of the connecting-bar by bifurcating the end of the bar andboring holes longitudinally into the end of the hub for the forked endof the bar; but this, also, is an expensive construction when comparedwith the construction of this invention. The slot receives the inner endof the coupling-bar to a greater or less depth, according to thethickness of the door, and is deep enough to take up the surplus lengthof the coupling-bar, produced by thin doors, and hence by all doors ofintermediate thickness up to ordinary thick doors, which will take upthe bar, so as to leave only enough extra [0 of a depth somewhat shortof the Whole length of the hub, substantially as and pose described.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

for the pur- WILLIAM E. SPARKS.

Witnesses:

JOHN II. SHAW, MARY E. UOGGAN.

